Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm
[pandora-kernel.git] / arch / sparc64 / kernel / viohs.c
1 /* viohs.c: LDOM Virtual I/O handshake helper layer.
2  *
3  * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
4  */
5
6 #include <linux/kernel.h>
7 #include <linux/module.h>
8 #include <linux/string.h>
9 #include <linux/delay.h>
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12
13 #include <asm/ldc.h>
14 #include <asm/vio.h>
15
16 int vio_ldc_send(struct vio_driver_state *vio, void *data, int len)
17 {
18         int err, limit = 1000;
19
20         err = -EINVAL;
21         while (limit-- > 0) {
22                 err = ldc_write(vio->lp, data, len);
23                 if (!err || (err != -EAGAIN))
24                         break;
25                 udelay(1);
26         }
27
28         return err;
29 }
30 EXPORT_SYMBOL(vio_ldc_send);
31
32 static int send_ctrl(struct vio_driver_state *vio,
33                      struct vio_msg_tag *tag, int len)
34 {
35         tag->sid = vio_send_sid(vio);
36         return vio_ldc_send(vio, tag, len);
37 }
38
39 static void init_tag(struct vio_msg_tag *tag, u8 type, u8 stype, u16 stype_env)
40 {
41         tag->type = type;
42         tag->stype = stype;
43         tag->stype_env = stype_env;
44 }
45
46 static int send_version(struct vio_driver_state *vio, u16 major, u16 minor)
47 {
48         struct vio_ver_info pkt;
49
50         vio->_local_sid = (u32) sched_clock();
51
52         memset(&pkt, 0, sizeof(pkt));
53         init_tag(&pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_VER_INFO);
54         pkt.major = major;
55         pkt.minor = minor;
56         pkt.dev_class = vio->dev_class;
57
58         viodbg(HS, "SEND VERSION INFO maj[%u] min[%u] devclass[%u]\n",
59                major, minor, vio->dev_class);
60
61         return send_ctrl(vio, &pkt.tag, sizeof(pkt));
62 }
63
64 static int start_handshake(struct vio_driver_state *vio)
65 {
66         int err;
67
68         viodbg(HS, "START HANDSHAKE\n");
69
70         vio->hs_state = VIO_HS_INVALID;
71
72         err = send_version(vio,
73                            vio->ver_table[0].major,
74                            vio->ver_table[0].minor);
75         if (err < 0)
76                 return err;
77
78         return 0;
79 }
80
81 static void flush_rx_dring(struct vio_driver_state *vio)
82 {
83         struct vio_dring_state *dr;
84         u64 ident;
85
86         BUG_ON(!(vio->dr_state & VIO_DR_STATE_RXREG));
87
88         dr = &vio->drings[VIO_DRIVER_RX_RING];
89         ident = dr->ident;
90
91         BUG_ON(!vio->desc_buf);
92         kfree(vio->desc_buf);
93         vio->desc_buf = NULL;
94
95         memset(dr, 0, sizeof(*dr));
96         dr->ident = ident;
97 }
98
99 void vio_link_state_change(struct vio_driver_state *vio, int event)
100 {
101         if (event == LDC_EVENT_UP) {
102                 vio->hs_state = VIO_HS_INVALID;
103
104                 switch (vio->dev_class) {
105                 case VDEV_NETWORK:
106                 case VDEV_NETWORK_SWITCH:
107                         vio->dr_state = (VIO_DR_STATE_TXREQ |
108                                          VIO_DR_STATE_RXREQ);
109                         break;
110
111                 case VDEV_DISK:
112                         vio->dr_state = VIO_DR_STATE_TXREQ;
113                         break;
114                 case VDEV_DISK_SERVER:
115                         vio->dr_state = VIO_DR_STATE_RXREQ;
116                         break;
117                 }
118                 start_handshake(vio);
119         } else if (event == LDC_EVENT_RESET) {
120                 vio->hs_state = VIO_HS_INVALID;
121
122                 if (vio->dr_state & VIO_DR_STATE_RXREG)
123                         flush_rx_dring(vio);
124
125                 vio->dr_state = 0x00;
126                 memset(&vio->ver, 0, sizeof(vio->ver));
127
128                 ldc_disconnect(vio->lp);
129         }
130 }
131 EXPORT_SYMBOL(vio_link_state_change);
132
133 static int handshake_failure(struct vio_driver_state *vio)
134 {
135         struct vio_dring_state *dr;
136
137         /* XXX Put policy here...  Perhaps start a timer to fire
138          * XXX in 100 ms, which will bring the link up and retry
139          * XXX the handshake.
140          */
141
142         viodbg(HS, "HANDSHAKE FAILURE\n");
143
144         vio->dr_state &= ~(VIO_DR_STATE_TXREG |
145                            VIO_DR_STATE_RXREG);
146
147         dr = &vio->drings[VIO_DRIVER_RX_RING];
148         memset(dr, 0, sizeof(*dr));
149
150         kfree(vio->desc_buf);
151         vio->desc_buf = NULL;
152         vio->desc_buf_len = 0;
153
154         vio->hs_state = VIO_HS_INVALID;
155
156         return -ECONNRESET;
157 }
158
159 static int process_unknown(struct vio_driver_state *vio, void *arg)
160 {
161         struct vio_msg_tag *pkt = arg;
162
163         viodbg(HS, "UNKNOWN CONTROL [%02x:%02x:%04x:%08x]\n",
164                pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
165
166         printk(KERN_ERR "vio: ID[%lu] Resetting connection.\n",
167                vio->vdev->channel_id);
168
169         ldc_disconnect(vio->lp);
170
171         return -ECONNRESET;
172 }
173
174 static int send_dreg(struct vio_driver_state *vio)
175 {
176         struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_TX_RING];
177         union {
178                 struct vio_dring_register pkt;
179                 char all[sizeof(struct vio_dring_register) +
180                          (sizeof(struct ldc_trans_cookie) *
181                           dr->ncookies)];
182         } u;
183         int i;
184
185         memset(&u, 0, sizeof(u));
186         init_tag(&u.pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_DRING_REG);
187         u.pkt.dring_ident = 0;
188         u.pkt.num_descr = dr->num_entries;
189         u.pkt.descr_size = dr->entry_size;
190         u.pkt.options = VIO_TX_DRING;
191         u.pkt.num_cookies = dr->ncookies;
192
193         viodbg(HS, "SEND DRING_REG INFO ndesc[%u] dsz[%u] opt[0x%x] "
194                "ncookies[%u]\n",
195                u.pkt.num_descr, u.pkt.descr_size, u.pkt.options,
196                u.pkt.num_cookies);
197
198         for (i = 0; i < dr->ncookies; i++) {
199                 u.pkt.cookies[i] = dr->cookies[i];
200
201                 viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n",
202                        i,
203                        (unsigned long long) u.pkt.cookies[i].cookie_addr,
204                        (unsigned long long) u.pkt.cookies[i].cookie_size);
205         }
206
207         return send_ctrl(vio, &u.pkt.tag, sizeof(u));
208 }
209
210 static int send_rdx(struct vio_driver_state *vio)
211 {
212         struct vio_rdx pkt;
213
214         memset(&pkt, 0, sizeof(pkt));
215
216         init_tag(&pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_RDX);
217
218         viodbg(HS, "SEND RDX INFO\n");
219
220         return send_ctrl(vio, &pkt.tag, sizeof(pkt));
221 }
222
223 static int send_attr(struct vio_driver_state *vio)
224 {
225         return vio->ops->send_attr(vio);
226 }
227
228 static struct vio_version *find_by_major(struct vio_driver_state *vio,
229                                          u16 major)
230 {
231         struct vio_version *ret = NULL;
232         int i;
233
234         for (i = 0; i < vio->ver_table_entries; i++) {
235                 struct vio_version *v = &vio->ver_table[i];
236                 if (v->major <= major) {
237                         ret = v;
238                         break;
239                 }
240         }
241         return ret;
242 }
243
244 static int process_ver_info(struct vio_driver_state *vio,
245                             struct vio_ver_info *pkt)
246 {
247         struct vio_version *vap;
248         int err;
249
250         viodbg(HS, "GOT VERSION INFO maj[%u] min[%u] devclass[%u]\n",
251                pkt->major, pkt->minor, pkt->dev_class);
252
253         if (vio->hs_state != VIO_HS_INVALID) {
254                 /* XXX Perhaps invoke start_handshake? XXX */
255                 memset(&vio->ver, 0, sizeof(vio->ver));
256                 vio->hs_state = VIO_HS_INVALID;
257         }
258
259         vap = find_by_major(vio, pkt->major);
260
261         vio->_peer_sid = pkt->tag.sid;
262
263         if (!vap) {
264                 pkt->tag.stype = VIO_SUBTYPE_NACK;
265                 pkt->major = 0;
266                 pkt->minor = 0;
267                 viodbg(HS, "SEND VERSION NACK maj[0] min[0]\n");
268                 err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
269         } else if (vap->major != pkt->major) {
270                 pkt->tag.stype = VIO_SUBTYPE_NACK;
271                 pkt->major = vap->major;
272                 pkt->minor = vap->minor;
273                 viodbg(HS, "SEND VERSION NACK maj[%u] min[%u]\n",
274                        pkt->major, pkt->minor);
275                 err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
276         } else {
277                 struct vio_version ver = {
278                         .major = pkt->major,
279                         .minor = pkt->minor,
280                 };
281                 if (ver.minor > vap->minor)
282                         ver.minor = vap->minor;
283                 pkt->minor = ver.minor;
284                 pkt->tag.stype = VIO_SUBTYPE_ACK;
285                 viodbg(HS, "SEND VERSION ACK maj[%u] min[%u]\n",
286                        pkt->major, pkt->minor);
287                 err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
288                 if (err > 0) {
289                         vio->ver = ver;
290                         vio->hs_state = VIO_HS_GOTVERS;
291                 }
292         }
293         if (err < 0)
294                 return handshake_failure(vio);
295
296         return 0;
297 }
298
299 static int process_ver_ack(struct vio_driver_state *vio,
300                            struct vio_ver_info *pkt)
301 {
302         viodbg(HS, "GOT VERSION ACK maj[%u] min[%u] devclass[%u]\n",
303                pkt->major, pkt->minor, pkt->dev_class);
304
305         if (vio->hs_state & VIO_HS_GOTVERS) {
306                 if (vio->ver.major != pkt->major ||
307                     vio->ver.minor != pkt->minor) {
308                         pkt->tag.stype = VIO_SUBTYPE_NACK;
309                         (void) send_ctrl(vio, &pkt->tag, sizeof(*pkt));
310                         return handshake_failure(vio);
311                 }
312         } else {
313                 vio->ver.major = pkt->major;
314                 vio->ver.minor = pkt->minor;
315                 vio->hs_state = VIO_HS_GOTVERS;
316         }
317
318         switch (vio->dev_class) {
319         case VDEV_NETWORK:
320         case VDEV_DISK:
321                 if (send_attr(vio) < 0)
322                         return handshake_failure(vio);
323                 break;
324
325         default:
326                 break;
327         }
328
329         return 0;
330 }
331
332 static int process_ver_nack(struct vio_driver_state *vio,
333                             struct vio_ver_info *pkt)
334 {
335         struct vio_version *nver;
336
337         viodbg(HS, "GOT VERSION NACK maj[%u] min[%u] devclass[%u]\n",
338                pkt->major, pkt->minor, pkt->dev_class);
339
340         if ((pkt->major == 0 && pkt->minor == 0) ||
341             !(nver = find_by_major(vio, pkt->major)))
342                 return handshake_failure(vio);
343
344         if (send_version(vio, nver->major, nver->minor) < 0)
345                 return handshake_failure(vio);
346
347         return 0;
348 }
349
350 static int process_ver(struct vio_driver_state *vio, struct vio_ver_info *pkt)
351 {
352         switch (pkt->tag.stype) {
353         case VIO_SUBTYPE_INFO:
354                 return process_ver_info(vio, pkt);
355
356         case VIO_SUBTYPE_ACK:
357                 return process_ver_ack(vio, pkt);
358
359         case VIO_SUBTYPE_NACK:
360                 return process_ver_nack(vio, pkt);
361
362         default:
363                 return handshake_failure(vio);
364         };
365 }
366
367 static int process_attr(struct vio_driver_state *vio, void *pkt)
368 {
369         int err;
370
371         if (!(vio->hs_state & VIO_HS_GOTVERS))
372                 return handshake_failure(vio);
373
374         err = vio->ops->handle_attr(vio, pkt);
375         if (err < 0) {
376                 return handshake_failure(vio);
377         } else {
378                 vio->hs_state |= VIO_HS_GOT_ATTR;
379
380                 if ((vio->dr_state & VIO_DR_STATE_TXREQ) &&
381                     !(vio->hs_state & VIO_HS_SENT_DREG)) {
382                         if (send_dreg(vio) < 0)
383                                 return handshake_failure(vio);
384
385                         vio->hs_state |= VIO_HS_SENT_DREG;
386                 }
387         }
388         return 0;
389 }
390
391 static int all_drings_registered(struct vio_driver_state *vio)
392 {
393         int need_rx, need_tx;
394
395         need_rx = (vio->dr_state & VIO_DR_STATE_RXREQ);
396         need_tx = (vio->dr_state & VIO_DR_STATE_TXREQ);
397
398         if (need_rx &&
399             !(vio->dr_state & VIO_DR_STATE_RXREG))
400                 return 0;
401
402         if (need_tx &&
403             !(vio->dr_state & VIO_DR_STATE_TXREG))
404                 return 0;
405
406         return 1;
407 }
408
409 static int process_dreg_info(struct vio_driver_state *vio,
410                              struct vio_dring_register *pkt)
411 {
412         struct vio_dring_state *dr;
413         int i, len;
414
415         viodbg(HS, "GOT DRING_REG INFO ident[%llx] "
416                "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
417                (unsigned long long) pkt->dring_ident,
418                pkt->num_descr, pkt->descr_size, pkt->options,
419                pkt->num_cookies);
420
421         if (!(vio->dr_state & VIO_DR_STATE_RXREQ))
422                 goto send_nack;
423
424         if (vio->dr_state & VIO_DR_STATE_RXREG)
425                 goto send_nack;
426
427         BUG_ON(vio->desc_buf);
428
429         vio->desc_buf = kzalloc(pkt->descr_size, GFP_ATOMIC);
430         if (!vio->desc_buf)
431                 goto send_nack;
432
433         vio->desc_buf_len = pkt->descr_size;
434
435         dr = &vio->drings[VIO_DRIVER_RX_RING];
436
437         dr->num_entries = pkt->num_descr;
438         dr->entry_size = pkt->descr_size;
439         dr->ncookies = pkt->num_cookies;
440         for (i = 0; i < dr->ncookies; i++) {
441                 dr->cookies[i] = pkt->cookies[i];
442
443                 viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n",
444                        i,
445                        (unsigned long long)
446                        pkt->cookies[i].cookie_addr,
447                        (unsigned long long)
448                        pkt->cookies[i].cookie_size);
449         }
450
451         pkt->tag.stype = VIO_SUBTYPE_ACK;
452         pkt->dring_ident = ++dr->ident;
453
454         viodbg(HS, "SEND DRING_REG ACK ident[%llx]\n",
455                (unsigned long long) pkt->dring_ident);
456
457         len = (sizeof(*pkt) +
458                (dr->ncookies * sizeof(struct ldc_trans_cookie)));
459         if (send_ctrl(vio, &pkt->tag, len) < 0)
460                 goto send_nack;
461
462         vio->dr_state |= VIO_DR_STATE_RXREG;
463
464         return 0;
465
466 send_nack:
467         pkt->tag.stype = VIO_SUBTYPE_NACK;
468         viodbg(HS, "SEND DRING_REG NACK\n");
469         (void) send_ctrl(vio, &pkt->tag, sizeof(*pkt));
470
471         return handshake_failure(vio);
472 }
473
474 static int process_dreg_ack(struct vio_driver_state *vio,
475                             struct vio_dring_register *pkt)
476 {
477         struct vio_dring_state *dr;
478
479         viodbg(HS, "GOT DRING_REG ACK ident[%llx] "
480                "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
481                (unsigned long long) pkt->dring_ident,
482                pkt->num_descr, pkt->descr_size, pkt->options,
483                pkt->num_cookies);
484
485         dr = &vio->drings[VIO_DRIVER_TX_RING];
486
487         if (!(vio->dr_state & VIO_DR_STATE_TXREQ))
488                 return handshake_failure(vio);
489
490         dr->ident = pkt->dring_ident;
491         vio->dr_state |= VIO_DR_STATE_TXREG;
492
493         if (all_drings_registered(vio)) {
494                 if (send_rdx(vio) < 0)
495                         return handshake_failure(vio);
496                 vio->hs_state = VIO_HS_SENT_RDX;
497         }
498         return 0;
499 }
500
501 static int process_dreg_nack(struct vio_driver_state *vio,
502                              struct vio_dring_register *pkt)
503 {
504         viodbg(HS, "GOT DRING_REG NACK ident[%llx] "
505                "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
506                (unsigned long long) pkt->dring_ident,
507                pkt->num_descr, pkt->descr_size, pkt->options,
508                pkt->num_cookies);
509
510         return handshake_failure(vio);
511 }
512
513 static int process_dreg(struct vio_driver_state *vio,
514                         struct vio_dring_register *pkt)
515 {
516         if (!(vio->hs_state & VIO_HS_GOTVERS))
517                 return handshake_failure(vio);
518
519         switch (pkt->tag.stype) {
520         case VIO_SUBTYPE_INFO:
521                 return process_dreg_info(vio, pkt);
522
523         case VIO_SUBTYPE_ACK:
524                 return process_dreg_ack(vio, pkt);
525
526         case VIO_SUBTYPE_NACK:
527                 return process_dreg_nack(vio, pkt);
528
529         default:
530                 return handshake_failure(vio);
531         }
532 }
533
534 static int process_dunreg(struct vio_driver_state *vio,
535                           struct vio_dring_unregister *pkt)
536 {
537         struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_RX_RING];
538
539         viodbg(HS, "GOT DRING_UNREG\n");
540
541         if (pkt->dring_ident != dr->ident)
542                 return 0;
543
544         vio->dr_state &= ~VIO_DR_STATE_RXREG;
545
546         memset(dr, 0, sizeof(*dr));
547
548         kfree(vio->desc_buf);
549         vio->desc_buf = NULL;
550         vio->desc_buf_len = 0;
551
552         return 0;
553 }
554
555 static int process_rdx_info(struct vio_driver_state *vio, struct vio_rdx *pkt)
556 {
557         viodbg(HS, "GOT RDX INFO\n");
558
559         pkt->tag.stype = VIO_SUBTYPE_ACK;
560         viodbg(HS, "SEND RDX ACK\n");
561         if (send_ctrl(vio, &pkt->tag, sizeof(*pkt)) < 0)
562                 return handshake_failure(vio);
563
564         vio->hs_state |= VIO_HS_SENT_RDX_ACK;
565         return 0;
566 }
567
568 static int process_rdx_ack(struct vio_driver_state *vio, struct vio_rdx *pkt)
569 {
570         viodbg(HS, "GOT RDX ACK\n");
571
572         if (!(vio->hs_state & VIO_HS_SENT_RDX))
573                 return handshake_failure(vio);
574
575         vio->hs_state |= VIO_HS_GOT_RDX_ACK;
576         return 0;
577 }
578
579 static int process_rdx_nack(struct vio_driver_state *vio, struct vio_rdx *pkt)
580 {
581         viodbg(HS, "GOT RDX NACK\n");
582
583         return handshake_failure(vio);
584 }
585
586 static int process_rdx(struct vio_driver_state *vio, struct vio_rdx *pkt)
587 {
588         if (!all_drings_registered(vio))
589                 handshake_failure(vio);
590
591         switch (pkt->tag.stype) {
592         case VIO_SUBTYPE_INFO:
593                 return process_rdx_info(vio, pkt);
594
595         case VIO_SUBTYPE_ACK:
596                 return process_rdx_ack(vio, pkt);
597
598         case VIO_SUBTYPE_NACK:
599                 return process_rdx_nack(vio, pkt);
600
601         default:
602                 return handshake_failure(vio);
603         }
604 }
605
606 int vio_control_pkt_engine(struct vio_driver_state *vio, void *pkt)
607 {
608         struct vio_msg_tag *tag = pkt;
609         u8 prev_state = vio->hs_state;
610         int err;
611
612         switch (tag->stype_env) {
613         case VIO_VER_INFO:
614                 err = process_ver(vio, pkt);
615                 break;
616
617         case VIO_ATTR_INFO:
618                 err = process_attr(vio, pkt);
619                 break;
620
621         case VIO_DRING_REG:
622                 err = process_dreg(vio, pkt);
623                 break;
624
625         case VIO_DRING_UNREG:
626                 err = process_dunreg(vio, pkt);
627                 break;
628
629         case VIO_RDX:
630                 err = process_rdx(vio, pkt);
631                 break;
632
633         default:
634                 err = process_unknown(vio, pkt);
635                 break;
636         }
637         if (!err &&
638             vio->hs_state != prev_state &&
639             (vio->hs_state & VIO_HS_COMPLETE))
640                 vio->ops->handshake_complete(vio);
641
642         return err;
643 }
644 EXPORT_SYMBOL(vio_control_pkt_engine);
645
646 void vio_conn_reset(struct vio_driver_state *vio)
647 {
648 }
649 EXPORT_SYMBOL(vio_conn_reset);
650
651 /* The issue is that the Solaris virtual disk server just mirrors the
652  * SID values it gets from the client peer.  So we work around that
653  * here in vio_{validate,send}_sid() so that the drivers don't need
654  * to be aware of this crap.
655  */
656 int vio_validate_sid(struct vio_driver_state *vio, struct vio_msg_tag *tp)
657 {
658         u32 sid;
659
660         /* Always let VERSION+INFO packets through unchecked, they
661          * define the new SID.
662          */
663         if (tp->type == VIO_TYPE_CTRL &&
664             tp->stype == VIO_SUBTYPE_INFO &&
665             tp->stype_env == VIO_VER_INFO)
666                 return 0;
667
668         /* Ok, now figure out which SID to use.  */
669         switch (vio->dev_class) {
670         case VDEV_NETWORK:
671         case VDEV_NETWORK_SWITCH:
672         case VDEV_DISK_SERVER:
673         default:
674                 sid = vio->_peer_sid;
675                 break;
676
677         case VDEV_DISK:
678                 sid = vio->_local_sid;
679                 break;
680         }
681
682         if (sid == tp->sid)
683                 return 0;
684         viodbg(DATA, "BAD SID tag->sid[%08x] peer_sid[%08x] local_sid[%08x]\n",
685                tp->sid, vio->_peer_sid, vio->_local_sid);
686         return -EINVAL;
687 }
688 EXPORT_SYMBOL(vio_validate_sid);
689
690 u32 vio_send_sid(struct vio_driver_state *vio)
691 {
692         switch (vio->dev_class) {
693         case VDEV_NETWORK:
694         case VDEV_NETWORK_SWITCH:
695         case VDEV_DISK:
696         default:
697                 return vio->_local_sid;
698
699         case VDEV_DISK_SERVER:
700                 return vio->_peer_sid;
701         }
702 }
703 EXPORT_SYMBOL(vio_send_sid);
704
705 int vio_ldc_alloc(struct vio_driver_state *vio,
706                          struct ldc_channel_config *base_cfg,
707                          void *event_arg)
708 {
709         struct ldc_channel_config cfg = *base_cfg;
710         struct ldc_channel *lp;
711
712         cfg.tx_irq = vio->vdev->tx_irq;
713         cfg.rx_irq = vio->vdev->rx_irq;
714
715         lp = ldc_alloc(vio->vdev->channel_id, &cfg, event_arg);
716         if (IS_ERR(lp))
717                 return PTR_ERR(lp);
718
719         vio->lp = lp;
720
721         return 0;
722 }
723 EXPORT_SYMBOL(vio_ldc_alloc);
724
725 void vio_ldc_free(struct vio_driver_state *vio)
726 {
727         ldc_free(vio->lp);
728         vio->lp = NULL;
729
730         kfree(vio->desc_buf);
731         vio->desc_buf = NULL;
732         vio->desc_buf_len = 0;
733 }
734 EXPORT_SYMBOL(vio_ldc_free);
735
736 void vio_port_up(struct vio_driver_state *vio)
737 {
738         unsigned long flags;
739         int err, state;
740
741         spin_lock_irqsave(&vio->lock, flags);
742
743         state = ldc_state(vio->lp);
744
745         err = 0;
746         if (state == LDC_STATE_INIT) {
747                 err = ldc_bind(vio->lp, vio->name);
748                 if (err)
749                         printk(KERN_WARNING "%s: Port %lu bind failed, "
750                                "err=%d\n",
751                                vio->name, vio->vdev->channel_id, err);
752         }
753
754         if (!err) {
755                 err = ldc_connect(vio->lp);
756                 if (err)
757                         printk(KERN_WARNING "%s: Port %lu connect failed, "
758                                "err=%d\n",
759                                vio->name, vio->vdev->channel_id, err);
760         }
761         if (err) {
762                 unsigned long expires = jiffies + HZ;
763
764                 expires = round_jiffies(expires);
765                 mod_timer(&vio->timer, expires);
766         }
767
768         spin_unlock_irqrestore(&vio->lock, flags);
769 }
770 EXPORT_SYMBOL(vio_port_up);
771
772 static void vio_port_timer(unsigned long _arg)
773 {
774         struct vio_driver_state *vio = (struct vio_driver_state *) _arg;
775
776         vio_port_up(vio);
777 }
778
779 int vio_driver_init(struct vio_driver_state *vio, struct vio_dev *vdev,
780                     u8 dev_class, struct vio_version *ver_table,
781                     int ver_table_size, struct vio_driver_ops *ops,
782                     char *name)
783 {
784         switch (dev_class) {
785         case VDEV_NETWORK:
786         case VDEV_NETWORK_SWITCH:
787         case VDEV_DISK:
788         case VDEV_DISK_SERVER:
789                 break;
790
791         default:
792                 return -EINVAL;
793         }
794
795         if (!ops->send_attr ||
796             !ops->handle_attr ||
797             !ops->handshake_complete)
798                 return -EINVAL;
799
800         if (!ver_table || ver_table_size < 0)
801                 return -EINVAL;
802
803         if (!name)
804                 return -EINVAL;
805
806         spin_lock_init(&vio->lock);
807
808         vio->name = name;
809
810         vio->dev_class = dev_class;
811         vio->vdev = vdev;
812
813         vio->ver_table = ver_table;
814         vio->ver_table_entries = ver_table_size;
815
816         vio->ops = ops;
817
818         setup_timer(&vio->timer, vio_port_timer, (unsigned long) vio);
819
820         return 0;
821 }
822 EXPORT_SYMBOL(vio_driver_init);